Answer:
Mary should swim 2 hours and 48 minutes for each morning practice.
Step-by-step explanation:
Assuming that she swims 2 hours in the evening, Mary should swim 10 hours in the evening per week and 14 hours in the morning.
Divide 14 hours by 5 since she swims 5 days per week for a total of 2.8 hours per week. Since it is 80% of an hour, you could safely assume that she swims 48 minutes which totals to 2 hours and 48 minutes.
Answer:
n=21000.
Step-by-step explanation:
$3.60
She will decrease the amount of work
Without the ramp, Ingrid would have to, in no particular order,
• push the box along the ground, which amounts of (20 N) (5 m) = 100 J of work
• lift the box up some height <em>h</em> with a force at least equal in magnitude to the weight of the box <em>mg</em>, so that the work done in the lifting is <em>mgh</em> (i.e. the energy required to lift the box with constant speed to a height <em>h</em>)
and the total work done in this way would be (100 + <em>mgh</em>) J.
With the ramp, Ingrid would instead push the box a length equal to the hypotenuse of the right triangle formed by the two displacements above. Recall that the hypotenuse of any right triangle is always shorter than the sum of its legs' lengths. (This eliminates the third and fourth options.) So if the length of the ramp, or total displacement of the box along the ramp, is <em>s</em>, then the work done by pushing up the ramp is (10 N) <em>s</em> = 10<em>s</em> J
Answer: 98 yards
Step-by-step explanation:
In order to find the area of a square by the diagonal, all you need to do is square the length of the diagonal and then divide by 2. 7 is half of the length, so the full length is 14. 14 squared is 196. 196 divided by 2 is 98, which is your answer.
